Temperature dependence of coherent population trapping resonances |
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| Authors: | S Knappe J Kitching L Hollberg R Wynands |
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| Institution: | Institut für Angewandte Physik, Universit?t Bonn, Wegelerstrasse 8, 53115 Bonn, Germany, DE
National Institute of Standards and Technology, 325 S. Broadway, Boulder, CO 80305-3328, USA, US
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| Abstract: | We measure the properties of coherent population trapping (CPT) resonances in Cs vapor cells as a function of temperature.
We expected the CPT signal to increase with higher vapor density, but instead the signal fades away above a certain density.
Two possible density-dependent explanations are discussed: spin-exchange collisions, which are found to give no relevant contribution
at the temperatures considered here, and increased absorption due to the optical thickness of the vapor. The dependence of
the dark-line resonance amplitude as a function of cell temperature can be well represented by a simple model based on the
optical thickness of the vapor as a function of temperature.
Received: 30 November 2001 / Published online: 7 February 2002 |
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| Keywords: | PACS: 42 50 Gy 32 70 Jz 32 70 Fw 32 80 Bx 42 62 Eh |
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